function setActiveStyleSheet(title)
{
	var i, a, main;
	
	for(i=0; (a = document.getElementsByTagName("link")[i]); i++)
	{
		if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title"))
		{
			a.disabled = true;
			
			if(a.getAttribute("title") == title)
			{
				a.disabled = false;
			}
		}
	}
}

function getActiveStyleSheet()
{
	var i, a;
	
	for(i=0; (a = document.getElementsByTagName("link")[i]); i++)
	{
		if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled)
		{
			return a.getAttribute("title");
		}
	}
	
	return null;
}

function getPreferredStyleSheet()
{
	var i, a;
	
	for(i=0; (a = document.getElementsByTagName("link")[i]); i++)
	{
		if(a.getAttribute("rel").indexOf("style") != -1 &&
		   a.getAttribute("rel").indexOf("alt") == -1 &&
		   a.getAttribute("title"))
		{
			return a.getAttribute("title");
		}
	}
	
	return null;
}

function createCookie(name, value, days)
{
	if(days)
	{
		var date = new Date();
		date.setTime(date.getTime() + (days*24*60*60*1000));
		var expires = ";expires="+date.toGMTString();
	}
	else
	{
		expires = "";
	}
	
	document.cookie = name + "=" + value + expires + "; path=/";
}

function readCookie(name)
{
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	
	for(var i=0;i < ca.length;i++)
	{
		var c = ca[i];
		
		while(c.charAt(0) == ' ')
		{
			c = c.substring(1, c.length);
		}
		
		if(c.indexOf(nameEQ) == 0)
		{
			return c.substring(nameEQ.length, c.length);
		}
	}
	
	return null;
}

window.onload = function(e)
{
	var cookie = readCookie("style");
	var title = cookie ? cookie : getPreferredStyleSheet();
	setActiveStyleSheet(title);
}

window.onunload = function(e)
{
	var title = getActiveStyleSheet();
	createCookie("style", title, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);